Modius (plural modii) may refer to:

• an ancient Roman unit for dry measures, (8.73 L) roughly equivalent to a peck
• a medieval Roman unit for area, approximately 40 acres
• Modius (headdress), a type of cylindrical headdress so called for its resemblance to the measure of grain
• Modius, the family name of the Modia (gens)
• Modius (beetle), a genus in the family Eucnemidae

• All pages with titles beginning with Modius
• All pages with titles containing Modius
• Modi (disambiguation)
• Modia (disambiguation)
• Modis (disambiguation)